Equilibrium

Topics in this chapter

• Equilibrium Shifts and Le Chatelier
• Equilibrium Constants and Reaction Quotient
• Acid-Base Theories and Weak Electrolytes
• pH and Neutralization Calculations
• Buffers and Salt Hydrolysis
• Solubility Equilibria and Ksp

Cheat sheet

Practice questions

1. Question 1Q-B4AC3B

   For the reaction $2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$, the unit of equilibrium constant $K_c$ is:

   1. A.L mol^-1
   2. B.mol L^-1
   3. C.L^2 mol^-2
   4. D.no unit
   See the answer and solution
2. Question 2Q-76EF7B

   The pH of a $10^{-8}$ M HCl aqueous solution at 298 K is closest to:

   1. A.8.0
   2. B.6.98
   3. C.7.0
   4. D.10.0
   See the answer and solution
3. Question 3Q-FDE780

   If the equilibrium constant for the reaction $N_2(g) + O_2(g) \rightleftharpoons 2NO(g)$ is $K$, the equilibrium constant for the reaction $NO(g) \rightleftharpoons \frac{1}{2}N_2(g) + \frac{1}{2}O_2(g)$ will be:

   1. A.1/K
   2. B.K^2
   3. C.1/\sqrt{K}
   4. D.\sqrt{K}
   See the answer and solution
4. Question 4Q-685627

   What is the conjugate acid of $NH_2^-$?

   1. A.NH_4^+
   2. B.NH_3
   3. C.N_2H_4
   4. D.NH^2-
   See the answer and solution
5. Question 5Q-BDD554

   The solubility product ($K_{sp}$) of $Ag2CrO_4$ is $3.2 \times 10^{-11}$ at a certain temperature. What is the maximum concentration of $Ag^+$ ions in a saturated solution of $Ag_2CrO_4$?

   1. A.2.0 \times 10^{-4} M
   2. B.4.0 \times 10^{-4} M
   3. C.2.0 \times 10^{-3} M
   4. D.8.0 \times 10^{-4} M
   See the answer and solution